Perimeter and Missing Side Worksheets
Practice finding rectangle perimeters and missing side lengths with printable 3rd grade math problems.
Worksheet version 1 of 12. The answer key matches the current version.
Find the perimeter or the missing side. Opposite sides of each rectangle are equal.
1. Find the perimeter.
Answer: ____________________
2. Perimeter = 16 cm. Find a.
Answer: ____________________
3. Find the perimeter.
Answer: ____________________
4. Perimeter = 22 cm. Find a.
Answer: ____________________
5. Find the perimeter.
Answer: ____________________
6. Perimeter = 22 cm. Find a.
Answer: ____________________
About this worksheet
Perimeter measures the distance around a shape. Add all four sides, or use the known perimeter to find a missing side.
Print a student sheet, then choose “Show answer key” to print the matching answers. Choose “New worksheet” for another version; the answer key always follows the version on screen.
Practice aligned to CCSS 3.MD.D.8.
More practice: area and perimeter worksheets and 3rd grade math worksheets.